用简易手工量热计测定盐酸-氢氧化钠反应溶液比热

M. Fazal-ur-Rahman, Hafiz Zeshan Haider
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引用次数: 0

摘要

在化学学士的研究项目下,一对夫妇进行了一项研究研究。执行这个项目的主要目标是确定当酸和碱在手工量热计杯中混合在一起并在实验室条件下进行反应时溶液温度的变化,并确定反应是放热的还是吸热的。基本上,从这些溶液温度的变化,决定了溶液的比热或反应热。使用带秒表的分析温度计观察温度变化,并将所有变化记录在数据表上,而在整个实验工作完成后,应用热力学比热方程数学计算溶液比热,其数值为3214.72476 J或3.21472 KJ。可以看出,当碱与酸混合时,溶液温度迅速升高到最大值,表现为放热反应。在达到最大范围后,温度逐渐下降到恒定一致的最小范围。一致的温度范围终止了反应。所有温度范围的变化都非常仔细地记录下来,并在MS Excel数据表上绘制了一个图表,显示温度范围的所有起伏。
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Specific Heat of Solution of HCl-NaOH Reaction by a Simple Handmade Calorimeter
A research study was performed by couple of students under the research project of bachelor in chemistry. The main goal to perform this project was to determine the changes in temperature of solution when an acid and a base were mixed together inside the cups of handmade calorimeter and their reaction was proceeded under the lab conditions and to determine either reaction would be exothermic or endothermic. Basically, from these changes in temperature of solution, the specific Heat of solution or Heat of reaction was determining. Temperature changes were observed using analytical thermometer with stop watch and all changes were noted on datasheet, while after completion of the whole experimental work, a thermodynamic equation of specific Heat was applied to calculate the Specific Heat of solution mathematically in numeric value which was 3214.72476 J or 3.21472 KJ. It was seen that as the base was mixed into acid, the temperature of solution was increased to maximum rapidly showing the exothermic reaction. After reaching to maximum range, the temperature decreased gradually to its minimum range being constant and consistent. The consistent temperature range terminated the reaction. All variations in temperature ranges were recorded very carefully and a table with a graph showing all ups and downs in temperature ranges was drawn on MS Excel Data Sheet.
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